EBPOET ON THE CEPHALOPODA. 



167 



(PL XXXI. fig. 9) is short, entirely concealed within the mantle, and recurved, and at its 

 base bears an elongated, oval, articular depression for articulation with the mantle, the 

 corresponding part of which consists of a fine linear ridge, as in the Onyehians, Taono- 

 teuthids and Tracheloteuthis ; it is connected with the head by two rudimentary but 

 distinct ligaments, and has the prominent musculi depressores infundibuli which form 

 such a striking character of the last mentioned form. I was unable to ascertain whether 

 a valve is present. It agrees with Tracheloteuthis also in the posterior position of the 

 viscera. 



The Head is long, the eyes occupying the antero-inferior angles of it (fig. 8) ; the 

 bright shining spherical lenses are clearly visible protruding from the body of the eye ; 

 over each eye is a chromatophore. The mouth is elevated on a process longer than 

 the arms. 



Tlie Arms are quite rudimentary, the second pair being the longest, the others sub- 

 equal ; they bear one or two suckers. 



The Tentacles are short and stout without distinct clubs, but with suckers in four 

 rows at the extremities, and reaching down the greater part of the stem. 



The Gladius extends the whole length of the mantle, and is linear, somewhat 

 expanded behind. 



Dimensions. 



Length, total, 



End of "body to mantle-margin, 



Breadth of body, . 



Breadth of head, . 



Length of tentacle. 



about 14 mm. 

 9 „ 

 3 „ 

 2 



ahout 3 ,, 



Bathyteuthis, Hoyle. 



Bathyteuthis, Hoyle, Narr. Chall. Exp., vol. i. p. 272, May 1885. 

 Bentlioteuthis, Verrill, Third Catal, p. 401, July 1885. 



Body long, cylindrical, tapering but slightly behind ; Jins subterminal, small and 

 rounded ; mantle-connective an elongated linear ridge fitting into a similar shorter groove 

 on the base of the siphon, which is provided with a valve but has no dorsal bridles. 



Head large, very broad, with prominent eyes. 



Arms very short, slender and conical ; suckers very minute and in two or four 

 series. Buccal membrane large, with seven points, each bearing one or two 

 suckers. 



Tentacles long slender, without expanded clubs, but with numerous minute suckers. 



Gladius resembling that of Ommastrephes in front but expanded in the posterior 

 third. 



